After winning their first game thanks to the powerful trio of Komori, Goro, and Yamane at the bat and Goro's pitching Komori decides to set up another scrimmage to get the team ready for the summer tournament. The team they challenge is Tomonoura, but little do they know they are led by none other than Toshi. Toshi refuses the game but says he will accept a challenge from Goro. Out of four picthes Toshi gets two home runs and the other two are wild pitches. Toshi then reveals Goro's pitching has a huge flaw in it, so Goro takes the pitching style to Shigeno to try and learn what that flaw is so his team can win the summer tournament.
대회 시작에 즈음하여 고로와 코모리는 연습경기를 위해 토모노우라 중학교를 찾아간다.
그리고 거기에서 고로는 소꿉친구 토시야와 재회하게 되는데…
연습경기도 필요 없다면서 고로의 공을 너무나 가볍게 쳐내는 토시야.
고로의 공에 있는 치명적 결함이란?
